Magnon instability driven by heat current in magnetic bilayers

温度勾配によって引き起こされる磁気二層膜でのマグノン不安定性

大沼 悠一*; 安立 裕人; 齊藤 英治; 前川 禎通

Onuma, Yuichi*; Adachi, Hiroto; Saito, Eiji; Maekawa, Sadamichi

We theoretically demonstrate that in a ferromagnet/paramagnet bilayer, a magnon instability accompanied by a gigahertz microwave emission can be driven simply by means of a temperature bias. Employing many-body theory for investigating the effects of a phonon heat current on the magnon lifetime, we show that the magnon instability occurs upon the suppression of the umklapp scattering at low temperatures, leading to microwave emission. The present finding provides crucial information about the interplay of spin current and heat current.